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  • C08F36/04—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
  • C08F36/14—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated containing elements other than carbon and hydrogen
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  • C07D295/04—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms
  • C07D295/14—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
  • C07D295/145—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals with the ring nitrogen atoms and the carbon atoms with three bonds to hetero atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings
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  • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
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  • C08F136/04—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
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  • C08F4/00—Polymerisation catalysts
  • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
  • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
  • C08F4/52—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides selected from boron, aluminium, gallium, indium, thallium or rare earths
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  • C08F4/545—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with other compounds thereof rare earths being present, e.g. triethylaluminium + neodymium octanoate
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Definitions

• the present invention relates to a modifier useful for polymer modification, a modified conjugated diene-based polymer including a modifier-derived functional group, and a method of preparing the polymer.
• a natural rubber, a polyisoprene rubber, or a polybutadiene rubber is known as a rubber material having a low hysteresis loss, but these rubbers may have low wet skid resistance.
• a conjugated diene-based (co)polymer such as a styrene-butadiene rubber (hereinafter, referred to as “SBR”) or a butadiene rubber (hereinafter, referred to as “BR”), is prepared by emulsion polymerization or solution polymerization to be used as a rubber for a tire.
• the BR or SBR is typically used by being blended with a filler, such as silica or carbon black, to obtain physical properties required for a tire.
• a filler such as silica or carbon black
• a method of modifying a polymerization active site of a conjugated diene-based polymer obtained by anionic polymerization using organolithium with a functional group capable of interacting with the filler has been proposed.
• a method of modifying a polymerization active end of a conjugated diene-based polymer with a tin-based compound or introducing an amino group, or a method of modifying with an alkoxysilane derivative has been proposed.
• a method of increasing dispersibility of the BR and the filler such as silica or carbon black a method of modifying a living active terminal with a specific coupling agent or modifier has been developed in a living polymer obtained by coordination polymerization using a catalyst composition which includes a lanthanide rare earth element compound.
• the present invention provides a modifier useful for polymer modification.
• the present invention also provides a method of preparing the modifier.
• the present invention also provides a modified conjugated diene-based polymer having a high modification ratio which includes a modifier-derived functional group.
• the present invention also provides a method of preparing the modified conjugated diene-based polymer.
• R 1 , R 4 , and R 5 are each independently a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms,
• R 2 is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms, and
• R 3 is a connecting group represented by Formula 2 or Formula 3,
• R 6 is a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms; or a substituent represented by Formula 2-1 below,
• R 7 is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms, and
• R 8 to R 10 are each independently a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with an alkyl group having 1 to 20 carbon atoms,
• R 11 is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms, and
• R 12 and R 13 are each independently a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms.
• a method of preparing a modifier represented by Formula 1 which includes the steps of: performing a first reaction of a compound represented by Formula 4 and an alkyl ketone compound to prepare a compound represented by Formula 5 (step a); and performing a second reaction of the compound represented by Formula 5 and a compound represented by Formula 6 (step b).
• R 1 , R 4 , and R 5 are each independently a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms,
• R 2 is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms, and
• R 3 is a connecting group represented by Formula 2 or Formula 3,
• R 6 is a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms; or a substituent represented by Formula 2-1 below,
• R 8 to R 10 are each independently a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with an alkyl group having 1 to 20 carbon atoms,
• R 12 and R 13 are each independently a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms,
• R 14 is a substituent represented by Formula 4-1 or Formula 4-2,
• R 6 and R 7 are the same as defined above, and
• A is chlorine (Cl) or bromine (Br),
• R 7 to R 10 are the same as defined above, and
• R 16 is a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms; or —RNH 2 , wherein R is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms.
• a modified conjugated diene-based polymer including a functional group derived from the modifier represented by Formula 1.
• a method of preparing the modified conjugated diene-based polymer which includes the steps of: preparing an active polymer coupled with an organometal by polymerization of a conjugated diene-based monomer in a hydrocarbon solvent in the presence of a catalyst composition including a lanthanide rare earth element-containing compound (step 1); and reacting the active polymer with the modifier represented by Formula 1 (step 2).
• a modifier represented by Formula 1 according to the present invention has high anionic reactivity due to the introduction of an ester group, the modifier may easily react with an active site of a polymer, and thus, modification may be easily performed.
• a modified conjugated diene-based polymer according to the present invention may have excellent affinity with a filler, such as carbon black, by including a function group derived from the modifier represented by Formula 1.
• a method of preparing a modified conjugated diene-based polymer according to the present invention may easily prepare a modified conjugated diene-based polymer having a high modification ratio by using the modifier represented by Formula 1.
• the present invention provides a modifier useful for modification of a modified conjugated diene-based polymer.
• the modifier according to an embodiment of the present invention is represented by Formula 1 below.
• R 1 , R 4 , and R 5 are each independently a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms,
• R 2 is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms, and
• R 3 is a connecting group represented by Formula 2 or Formula 3 below,
• R 6 is a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms; or a substituent represented by Formula 2-1 below,
• R 7 is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms, and
• R 8 to R 10 are each independently a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with an alkyl group having 1 to 20 carbon atoms,
• R 11 is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms, and
• R 12 and R 13 are each independently a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms.
• R 1 , R 4 , and R 5 may each independently be a monovalent hydrocarbon group having 1 to 20 carbon atoms, or a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted with a substituent.
• R 1 , R 4 , and R 5 are each independently a monovalent hydrocarbon group having 1 to 20 carbon atoms
• R 1 , R 4 , and R 5 may each independently be selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, and an arylalkyl group having 7 to 20 carbon atoms
• R 1 , R 4 , and R 5 may each independently be selected from the group consisting of an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an arylalkyl group having 7 to 12 carbon atoms.
• R 1 , R 4 , and R 5 are each independently a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted with a substituent
• R 1 , R 4 , and R 5 may each independently be an alkyl group having 1 to 10 carbon atoms which is substituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, and an aryl group having 6 to 12 carbon atoms.
• R 2 may be a divalent hydrocarbon group having 1 to 20 carbon atoms or a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted with a substituent.
• R 2 is a divalent hydrocarbon group having 1 to 20 carbon atoms
• R 2 may be an alkylene group having 1 to 10 carbon atoms such as a methylene group, an ethylene group, or a propylene group; an arylene group having 6 to 20 carbon atoms such as a phenylene group; or an arylalkylene group having 7 to 20 carbon atoms as a combination group thereof.
• R 2 may be an alkylene group having 1 to 6 carbon atoms.
• R 2 is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted with a substituent
• R 2 may be one substituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms.
• R 3 is a connecting group represented by Formula 2 or Formula 3, wherein, in a case in which R 3 is a connecting group represented by Formula 2, in Formula 2, R 6 may be an unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms; a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted with at least one substituent selected from the group consisting of an alkyl group, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms; or a substituent represented by Formula 2-1, and R 7 may be a divalent hydrocarbon group having 1 to 20 carbon atoms, or a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted with an alkyl group having 1 to 20 carbon atoms.
• R 6 may be an alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms which is substituted with an alkyl group having 1 to 10 carbon atoms, or a substituent represented by Formula 2-1, wherein, in a case in which R 6 is a substituent represented by Formula 2-1, in Formula 2-1, R 11 may be an alkylene group having 1 to 6 carbon atoms, and R 12 and R 13 may each independently be an alkyl group having 1 to 6 carbon atoms which is substituted or unsubstituted with an alkyl group having 1 to 5 carbon atoms, and R 7 may be an alkylene group having 1 to 10 carbon atoms.
• R 8 to R 10 may each independently be a divalent hydrocarbon group having 1 to 20 carbon atoms, or a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted with an alkyl group having 1 to 20 carbon atoms, and, specifically, R 8 to R 10 may each independently be an alkylene group having 1 to 10 carbon atoms.
• R 1 , R 4 , and R 5 may each independently be an alkyl group having 1 to 6 carbon atoms which is substituted or unsubstituted with an alkyl group having 1 to 5 carbon atoms
• R 2 may be an alkylene group having 1 to 6 carbon atoms
• R 6 may be an alkyl group having 1 to 6 carbon atoms
• R 7 to R 10 may be an alkylene group having 1 to 6 carbon atoms.
• the modifier represented by Formula 1 may include compounds represented by the following Formulae 1-1 to 1-5.
• the modifier may have excellent solubility in a solvent.
• the modifier may have a solubility in 100 g of a non-polar solvent, for example, hexane, of 10 g or more at 25° C. and 1 atmosphere.
• the solubility of the modifier denotes a degree to which the modifier is clearly dissolved without a turbidity phenomenon during visual observation.
• the modifier according to the embodiment of the present invention may improve a modification ratio of a polymer by being used as a modifier for the polymer.
• the modifier represented by Formula 1 according to the present invention may easily modify a conjugated diene-based polymer at a high modification ratio by including a reactive functional group for the conjugated diene-based polymer, a filler affinity functional group, and a solvent affinity functional group, and may improve abrasion resistance, low fuel consumption property, and processability of a rubber composition including the modifier and a molded article, such as a tire, prepared therefrom.
• the modifier of Formula 1 may include an ester group, an amine group, an alkyl chain, and, in some cases, an imine group in the molecule as described above, and, since the ester group may modify the conjugated diene-based polymer at a high modification ratio by having a high reactivity with an active site of the conjugated diene-based polymer, the functional group substituted with the modifier may be introduced into the conjugated diene-based polymer in a high yield.
• the amine group may further improve affinity with a filler, particularly, carbon black, while reacting with a conjugated diene-based polymer end to be converted to a primary amino group.
• the alkyl chain may increase solubility of the modifier by improving affinity with a polymerization solvent, and thus, may improve a modification ratio with respect to the conjugated diene-based polymer.
• the present invention provides a method of preparing the modifier represented by Formula 1.
• the preparation method according to an embodiment of the present invention includes the steps of: performing a first reaction of a compound represented by Formula 4 and an alkyl ketone compound to prepare a compound represented by Formula 5 (step a); and performing a second reaction of the compound represented by Formula 5 and a compound represented by Formula 6 (step b).
• R 1 to R 5 are the same as defined above,
• R 14 is a substituent represented by Formula 4-1 or Formula 4-2,
• R 6 and R 7 are the same as defined above, and
• A is chlorine (Cl) or bromine (Br),
• R 7 to R 10 are the same as defined in claim 1 .
• R 16 is a monovalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms; or —RNH 2 , wherein R is a divalent hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms.
• the first reaction of step a is a step for preparing a compound represented by Formula 5, wherein the first reaction may be performed by reacting a compound represented by Formula 4 with an alkyl ketone compound.
• the compound represented by Formula 4 and the alkyl ketone compound may be used in a stoichiometric ratio, and, specifically, the compound represented by Formula 4 and the alkyl ketone compound may be used at a molar ratio of 1:1 to 1:2.
• the compound represented by Formula 4 and the alkyl ketone compound may be used at a molar ratio of 1:2.
• the first reaction may be performed in a temperature range of 110° C. to 160° C.
• the alkyl ketone compound is not particularly limited, but, for example, may be at least one selected from the group consisting of methyl isopropyl ketone, methyl isobutyl ketone, cyclohexanone, methyl ethyl ketone, diisopropyl ketone, ethyl butyl ketone, methyl butyl ketone, and dipropyl ketone.
• the second reaction of step b is a step for preparing the modifier represented by Formula 1, wherein the second reaction may be performed by reacting the compound represented by Formula 5 with a compound represented by Formula 6.
• the compound represented by Formula 5 and the compound represented by Formula 6 may be used in a stoichiometric ratio, and, for example, the compound represented by Formula 5 and the compound represented by Formula 6 may be used at a molar ratio of 1:1 to 1:2 and may specifically be used at a molar ratio of 1:1.5.
• the second reaction may be performed in a temperature range of 20° C. to 60° C.
• the present invention provides a modified conjugated diene-based polymer including a functional group derived from a modifier represented by Formula 1 below.
• R 1 to R 5 are the same as defined above.
• the modified conjugated diene-based polymer according to an embodiment of the present invention may be prepared by reacting an active polymer coupled with an organometal with the modifier represented by Formula 1 through a preparation method to be described later, and physical properties of the modified conjugated diene-based polymer may be improved by including the functional group derived from the modifier represented by Formula 1.
• the modifier represented by Formula 1 may be the same as described above.
• the modified conjugated diene-based polymer may include a filler affinity functional group and a solvent affinity functional group by including the functional group derived from the modifier represented by Formula 1, and thus, abrasion resistance, low fuel consumption property, and processability of a rubber composition including the modified conjugated diene-based polymer and a molded article, such as a tire, prepared therefrom may be improved.
• the modified conjugated diene-based polymer may have a number-average molecular weight (Mn) of 100,000 g/mol to 700,000 g/mol, for example, 120,000 g/mol to 500,000 g/mol.
• Mn number-average molecular weight
• the modified conjugated diene-based polymer may have a weight-average molecular weight (Mw) of 300,000 g/mol to 1,200,000 g/mol, for example, 400,000 g/mol to 1,000,000 g/mol.
• Mw weight-average molecular weight
• the modified conjugated diene-based polymer may have a molecular weight distribution (Mw/Mn) of 1.05 to 5.
• the weight-average molecular weight and the number-average molecular weight may satisfy the above-described ranges at the same time while the modified conjugated diene-based polymer has the above-described molecular weight distribution range.
• the modified conjugated diene-based polymer may have a molecular weight distribution of 3.4 or less, a weight-average molecular weight of 300,000 g/mol to 1,200,000 g/mol, and a number-average molecular weight of 100,000 g/mol to 700,000 g/mol, and, for example, may have a polydispersity of 3.2 or less, a weight-average molecular weight of 400,000 g/mol to 1,000,000 g/mol, and a number-average molecular weight of 120,000 g/mol to 500,000 g/mol.
• each of the weight-average molecular weight and the number-average molecular weight is a polystyrene-equivalent molecular weight analyzed by gel permeation chromatography (GPC), and the molecular weight distribution (Mw/Mn) is also known as polydispersity, wherein it was calculated as a ratio (Mw/Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn).
• GPC gel permeation chromatography
• the modified conjugated diene-based polymer according to the embodiment of the present invention may be a polymer having high linearity in which a value of ⁇ S/R (stress/relaxation) at 100° C. is 0.7 or more.
• the ⁇ S/R denotes a change in stress in response to the same amount of strain generated in a material, wherein it is an index indicating linearity of a polymer.
• the linearity of the polymer is low as the ⁇ S/R value is reduced, and rolling resistance or rotation resistance when the polymer is used in the rubber composition is increased as the linearity is reduced.
• branching degree and molecular weight distribution of the polymer may be estimated from the ⁇ S/R value, and the higher the ⁇ S/R value is, the higher the branching degree is and the wider the molecular weight distribution is. As a result, processability of the polymer is excellent, but mechanical properties are low.
• the modified conjugated diene-based polymer according to the embodiment of the present invention has a high ⁇ S/R value of 0.7 or more at 100° C. as described above, resistance characteristics and fuel consumption property may be excellent when used in the rubber composition.
• the ⁇ S/R value of the modified conjugated diene-based polymer may be in a range of 0.7 to 1.0.
• the ⁇ S/R value was measured with a large rotor at a rotor speed of 2 ⁇ 0.02 rpm at 100° C. using a Mooney viscometer, for example, MV2000E by Monsanto Company. Specifically, after the polymer was left standing for 30 minutes or more at room temperature (23 ⁇ 3° C.), 27 ⁇ 3 g of the polymer was taken and filled into a die cavity, Mooney viscosity was measured while applying a torque by operating a platen, and the ⁇ S/R value was obtained by measuring a slope of change in the Mooney viscosity obtained while the torque was released.
• a Mooney viscometer for example, MV2000E by Monsanto Company.
• the modified conjugated diene-based polymer may have a cis-1,4 bond content of a conjugated diene portion, which is measured by Fourier transform infrared spectroscopy (FT-IR), of 95% or more, for example, 98% or more.
• FT-IR Fourier transform infrared spectroscopy
• the modified conjugated diene-based polymer may have a vinyl content of the conjugated diene portion, which is measured by Fourier transform infrared spectroscopy, of 5% or less, for example, 2% or less.
• the vinyl content in the polymer is greater than 5%, the abrasion resistance, crack resistance, and ozone resistance of the rubber composition including the same may be deteriorated.
• the cis-1,4 bond content and vinyl content in the polymer are measured by the Fourier transform infrared spectroscopy (FT-IR) in which, after measuring a FT-IR transmittance spectrum of a carbon disulfide solution of the conjugated diene-based polymer which is prepared at a concentration of 5 mg/mL by using disulfide carbon of the same cell as a blank, each content was obtained by using a maximum peak value (a, base line) near 1,130 cm ⁇ 1 of the measurement spectrum, a minimum value (b) near 967 cm ⁇ 1 which indicates a trans-1,4 bond, a minimum value (c) near 911 cm ⁇ 1 which indicates a vinyl bond, and a minimum value (d) near 736 cm ⁇ 1 which indicates a cis-1,4 bond.
• FT-IR Fourier transform infrared spectroscopy
• the present invention provides a method of preparing a modified conjugated diene-based polymer including a functional group derived from the modifier represented by Formula 1.
• the preparation method includes the steps of: preparing an active polymer coupled with an organometal by polymerization of a conjugated diene-based monomer in a hydrocarbon solvent in the presence of a catalyst composition including a lanthanide rare earth element-containing compound (step 1); and reacting the active polymer with a modifier represented by Formula 1 (step 2).
• R 1 to R 5 are the same as defined above.
• Step 1 is a step for preparing an active polymer coupled with an organometal by using a catalyst composition including a lanthanide rare earth element-containing compound, wherein step 1 may be performed by polymerization of a conjugated diene-based monomer in a hydrocarbon solvent in the presence of the catalyst composition.
• the conjugated diene-based monomer is not particularly limited, but, for example, may be at least one selected from the group consisting of 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, isoprene, and 2-phenyl-1,3-butadiene.
• the hydrocarbon solvent is not particularly limited, but, for example, may be at least one selected from the group consisting of n-pentane, n-hexane, n-heptane, isooctane, cyclohexane, toluene, benzene, and xylene.
• the catalyst composition may be used in an amount such that the lanthanide rare earth element-containing compound is included in an amount of 0.1 mmol to 0.5 mmol based on total 100 g of the conjugated diene-based monomer, and may specifically be used in an amount such that the lanthanide rare earth element-containing compound is included in an amount of 0.1 mmol to 0.4 mmol, for example, 0.1 mmol to 0.25 mmol, based on total 100 g of the conjugated diene-based monomer.
• the lanthanide rare earth element-containing compound is not particularly limited, but, for example, may be at least one compound of rare earth metals with an atomic number of 57 to 71, such as lanthanum, neodymium, cerium, gadolinium, or praseodymium, and may specifically be a compound including at least one selected from the group consisting of neodymium, lanthanum, and gadolinium.
• the lanthanide rare earth element-containing compound may include carboxylates containing the above-described rare earth element (e.g., neodymium acetate, neodymium acrylate, neodymium methacrylate, neodymium gluconate, neodymium citrate, neodymium fumarate, neodymium lactate, neodymium maleate, neodymium oxalate, neodymium 2-ethylhexanoate, or neodymium neodecanoate); organophosphates containing the above-described rare earth element (e.g., neodymium dibutyl phosphate, neodymium dipentyl phosphate, neodymium dihexyl phosphate, neodymium diheptyl phosphate, neodymium dioctyl phosphate,
• the lanthanide rare earth element-containing compound may include a neodymium compound represented by Formula 7 below.
• R a to R c may each independently be hydrogen or a linear or branched alkyl group having 1 to 12 carbon atoms, but all of R a to R c are not hydrogen at the same time.
• the neodymium compound may be at least one selected from the group consisting of Nd(neodecanoate) 3 , Nd(2-ethylhexanoate) 3 , Nd(2,2-diethyl decanoate) 3 , Nd(2,2-dipropyl decanoate) 3 , Nd(2,2-dibutyl decanoate) 3 , Nd(2,2-dihexyl decanoate) 3 , Nd(2,2-dioctyl decanoate) 3 , Nd(2-ethyl-2-propyl decanoate) 3 , Nd(2-ethyl-2-butyl decanoate) 3 , Nd(2-ethyl-2-hexyl decanoate) 3 , Nd(2-propyl-2-butyl decanoate) 3 , Nd(2-propyl-2-butyl decanoate) 3 , Nd(2-propyl
• the lanthanide rare earth element-containing compound may specifically be a neodymium compound in which, in Formula 7, R a is a linear or branched alkyl group having 4 to 12 carbon atoms, and R b and R c are each independently hydrogen or an alkyl group having 2 to 8 carbon atoms, but R b and R c are not hydrogen at the same time.
• R a may be a linear or branched alkyl group having 6 to 8 carbon atoms
• R b and R c may each independently be hydrogen or an alkyl group having 2 to 6 carbon atoms, wherein R b and R c may not be hydrogen at the same time
• specific examples of the neodymium compound may be at least one selected from the group consisting of Nd(2,2-diethyl decanoate) 3 , Nd(2,2-dipropyl decanoate) 3 , Nd(2,2-dibutyl decanoate) 3 , Nd(2,2-dihexyl decanoate) 3 , Nd(2,2-dioctyl decanoate) 3 , Nd(2-ethyl-2-propyl decanoate) 3 , Nd(2-ethyl-2-butyl decanoate) 3 , Nd(2-ethyl-2-hexyl decanoate
• R a may be a linear or branched alkyl group having 6 to 8 carbon atoms
• R b and R c may each independently be an alkyl group having 2 to 6 carbon atoms.
• the neodymium compound represented by Formula 7 includes a carboxylate ligand including alkyl groups of various lengths having 2 or more carbon atoms as a substituent at an ⁇ (alpha) position, coagulation of the compound may be blocked by inducing steric changes around the neodymium center metal, and accordingly, oligomerization may be suppressed. Also, with respect to the neodymium compound, since a ratio of neodymium located in a center portion, which has high solubility in the polymerization solvent and has difficulties in conversion to the catalytically active species, is reduced, the rate of conversion to the catalytically active species is high.
• the lanthanide rare earth element-containing compound according to an embodiment of the present invention may have a solubility of about 4 g or more per 6 g of a non-polar solvent at room temperature (25° C.)
• the solubility of the neodymium compound denotes a degree to which the neodymium compound is clearly dissolved without a turbidity phenomenon, wherein since the neodymium compound has high solubility as described above, excellent catalytic activity may be achieved.
• the lanthanide rare earth element-containing compound according to the embodiment of the present invention may be used in the form of a reactant with a Lewis base.
• the reactant may improve the solubility of the lanthanide rare earth element-containing compound in the solvent and may be stored in a stable state for a long period of time by the Lewis base.
• the Lewis base for example, may be used in a ratio of 30 mol or less or 1 mole to 10 mol per 1 mol of the rare earth element.
• Lewis base may be acetylacetone, tetrahydrofuran, pyridine, N,N′-dimethylformamide, thiophene, diphenyl ether, triethylamine, an organic phosphorus compound, or a monohydric or dihydric alcohol.
• the catalyst composition may further include at least one of (a) alkylating agent, (b) halide, and (c) conjugated diene-based monomer, in addition to the lanthanide rare earth element-containing compound.
• the alkylating agent is an organometallic compound that may transfer a hydrocarbyl group to another metal, wherein it may act as a cocatalyst composition.
• the alkylating agent may be used without particular limitation as long as it is commonly used as an alkylating agent during the preparation of a diene-based polymer, and, for example, may be an organometallic compound, which is soluble in the polymerization solvent and contains a metal-carbon bond, such as an organoaluminum compound, an organomagnesium compound, or an organolithium compound.
• the organoaluminum compound may include alkylaluminum such as trimethylaluminum, triethylaluminum, tri-n-propylaluminum, triisopropylaluminum, tri-n-butylaluminum, triisobutylaluminum, tri-t-butylaluminum, tripentylaluminum, trihexylaluminum, tricyclohexylaluminum, or trioctylaluminum; dihydrocarbylaluminum hydride such as diethylaluminum hydride, di-n-propylaluminum hydride, diisopropylaluminum hydride, di-n-butylaluminum hydride, diisobutylaluminum hydride (DIBAH), di-n-octylaluminum hydride, diphenylaluminum hydride, di-p-tolylaluminum hydride, dibenz
• the organomagnesium compound may include an alkyl magnesium compound such as diethylmagnesium, di-n-propylmagnesium, diisopropylmagnesium, dibutylmagnesium, dihexylmagnesium, diphenylmagnesium, or dibenzylmagnesium, and the organolithium compound may include an alkyl lithium compound such as n-butyllithium.
• the organoaluminum compound may be aluminoxane.
• the aluminoxane may be prepared by reacting a trihydrocarbylaluminum-based compound with water, and may specifically be linear aluminoxane of the following Formula 8a or cyclic aluminoxane of the following Formula 8b.
• R is a monovalent organic group bonded to an aluminum atom through a carbon atom, wherein R may be a hydrocarbyl group, and x and y may each independently be an integer of 1 or more, particularly 1 to 100, and more particularly 2 to 50.
• the aluminoxane may include methylaluminoxane (MAO), modified methylaluminoxane (MAO), ethylaluminoxane, n-propylaluminoxane, isopropylaluminoxane, butylaluminoxane, isobutylaluminoxane, n-pentylaluminoxane, neopentylaluminoxane, n-hexylaluminoxane, n-octylaluminoxane, 2-ethylhexylaluminoxane, cylcohexylaluminoxane, 1-methylcyclopentylaluminoxane, phenylaluminoxane, or 2,6-dimethylphenylaluminoxane, and any one thereof or a mixture of two or more thereof may be used.
• MAO methylaluminoxane
• MAO modified methylaluminoxane
• the modified methylaluminoxane may be one in which a methyl group of methylaluminoxane is substituted with a formula group (R), specifically, a hydrocarbon group having 2 to 20 carbon atoms, wherein the modified methylaluminoxane may specifically be a compound represented by Formula 9 below.
• R is the same as defined above, and m and n may each independently be an integer of 2 or more. Also, in Formula 9, Me represents a methyl group.
• R may be an alkyl group having 2 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, a cycloalkenyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, an allyl group, or an alkynyl group having 2 to 20 carbon atoms, may particularly be an alkyl group having 2 to 20 carbon atoms such as an ethyl group, an isobutyl group, a hexyl group, or an octyl group, and may more particularly be an isobutyl group.
• the modified methylaluminoxane may be one in which about 50 mol % to 90 mol % of the methyl group of the methylaluminoxane is substituted with the above-described hydrocarbon group.
• the modified methylaluminoxane may increase catalytic activity by promoting alkylation.
• the modified methylaluminoxane may be prepared by a conventional method, and may specifically be prepared by using trimethylaluminum and alkylaluminum other than trimethylaluminum.
• the alkylaluminum may be triisopropylaluminum, triethylaluminum, trihexylaluminum, or trioctylaluminum, and any one thereof or a mixture of two or more thereof may be used.
• the catalyst composition according to an embodiment of the present invention may include the alkylating agent at a molar ratio of 1 to 200, particularly 1 to 100, and more particularly 3 to 20 based on 1 mol of the lanthanide rare earth element-containing compound.
• the alkylating agent is included at a molar ratio of greater than 200, catalytic reaction control is not easy during the preparation of the polymer, and an excessive amount of the alkylating agent may cause a side reaction.
• the halide is not particularly limited, but, for example, may include elemental halogen, an interhalogen compound, halogenated hydrogen, an organic halide, a non-metal halide, a metal halide, or an organic metal halide, and any one thereof or a mixture of two or more thereof may be used.
• any one selected from the group consisting of an organic halide, a metal halide, and an organic metal halide, or a mixture of two or more thereof may be used as the halide.
• the elemental halogen may include fluorine, chlorine, bromine, or iodine.
• the interhalogen compound may include iodine monochloride, iodine monobromide, iodine trichloride, iodine pentafluoride, iodine monofluoride, or iodine trifluoride.
• halogenated hydrogen may include hydrogen fluoride, hydrogen chloride, hydrogen bromide, or hydrogen iodide.
• the organic halide may include t-butyl chloride (t-BuCl), t-butyl bromide, allyl chloride, allyl bromide, benzyl chloride, benzyl bromide, chloro-di-phenylmethane, bromo-di-phenylmethane, triphenylmethyl chloride, triphenylmethyl bromide, benzylidene chloride, benzyliene bromide, methyltrichlorosilane, phenyltrichlorosilane, dimethyldichlorosilane, diphenyldichlorosilane, trimethylchlorosilane (TMSCl), benzoyl chloride, benzoyl bromide, propionyl chloride, propionyl bromide, methyl chloroformate, methyl bromoformate, iodomethane, diiodomethane, triiodomethane (also referred to as
• the non-metal halide may include phosphorous trichloride, phosphorous tribromide, phosphorous pentachloride, phosphorous oxychloride, phosphorous oxybromide, boron trifluoride, boron trichloride, boron tribromide, silicon tetrafluoride, silicon tetrachloride (SiCl 4 ), silicon tetrabromide, arsenic trichloride, arsenic tribromide, selenium tetrachloride, selenium tetrabromide, tellurium tetrachloride, tellurium tetrabromide, silicon tetraiodide, arsenic triiodide, tellurium tetraiodide, boron triiodide, phosphorous triiodide, phosphorous oxyiodide, or selenium tetraiodide.
• the metal halide may include tin tetrachloride, tin tetrabromide, aluminum trichloride, aluminum tribromide, antimony trichloride, antimony pentachloride, antimony tribromide, aluminum trifluoride, gallium trichloride, gallium tribromide, gallium trifluoride, indium trichloride, indium tribromide, indium trifluoride, titanium tetrachloride, titanium tetrabromide, zinc dichloride, zinc dibromide, zinc difluoride, aluminum triiodide, gallium triiodide, indium triiodide, titanium tetraiodide, zinc diiodide, germanium tetraiodide, tin tetraiodide, tin diiodide, antimony triiodide, or magnesium diiodide.
• the organic metal halide may include dimethylaluminum chloride, diethylaluminum chloride, dimethylaluminum bromide, diethylaluminum bromide, dimethylaluminum fluoride, diethylaluminum fluoride, methylaluminum dichloride, ethylaluminum dichloride, methylaluminum dibromide, ethylaluminum dibromide, methylaluminum difluoride, ethylaluminum difluoride, methylaluminum sesquichloride, ethylaluminum sesquichloride (EASC), isobutylaluminum sesquichloride, methylmagnesium chloride, methylmagnesium bromide, ethylmagnesium chloride, ethylmagnesium bromide, n-butylmagnesium chloride, n-butylmagnesium bromide, phenylmagnes
• the catalyst composition according to the embodiment of the present invention may include the halide in an amount of 1 mol to 20 mol, particularly 1 mol to 5 mol, and more particularly 2 mol to 3 mol based on 1 mol of the lanthanide rare earth element-containing compound.
• the halide is included in an amount of greater than mol, catalytic reaction control is not easy and an excessive amount of the halide may cause a side reaction.
• the catalyst composition for preparing a conjugated diene polymer according to the embodiment of the present invention may include a non-coordinating anion-containing compound or a non-coordinating anion precursor compound instead of the halide or with the halide.
• the non-coordinating anion is a sterically bulky anion that does not form a coordinate bond with an active center of a catalyst system due to steric hindrance, wherein the non-coordinating anion may be a tetraarylborate anion or a fluorinated tetraarylborate anion.
• the compound containing a non-coordinating anion may include a counter cation, for example, a carbonium cation such as a triarylcarbonium cation; an ammonium cation, such as N,N-dialkyl anilinium cation, or a phosphonium cation, in addition to the above-described non-coordinating anion.
• the compound containing a non-coordinating anion may include triphenylcarbonium tetrakis(pentafluorophenyl)borate, N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate, triphenylcarbonium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate, or N,N-dimethylanilinium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate.
• the non-coordinating anion precursor as a compound capable of forming a non-coordinating anion under the reaction conditions, may include a triaryl boron compound (BE 3 , where E is a strong electron-withdrawing aryl group such as a pentafluorophenyl group or 3,5-bis(trifluoromethyl)phenyl group).
• BE 3 triaryl boron compound
• the catalyst composition may further include a conjugated diene-based monomer, and, since the catalyst composition is used in the form of a performing catalyst composition in which a portion of the conjugated diene-based monomer used in the polymerization reaction is pre-polymerized by being premixed with the catalyst composition for polymerization, catalyst composition activity may not only be improved, but a conjugated diene-based polymer thus prepared may be stabilized.
• the expression “preforming” may denote that, in a case in which a catalyst composition including a lanthanide rare earth element-containing compound, an alkylating agent, and a halide, that is, a catalyst system includes diisobutylaluminum hydride (DIBAH), a small amount of a conjugated diene-based monomer, such as 1,3-butadiene, is added to reduce the possibility of producing various catalytically active species, and pre-polymerization is performed in the catalyst composition system with the addition of the 1,3-butadiene.
• DIBAH diisobutylaluminum hydride
• the expression “premix” may denote a state in which each compound is uniformly mixed in the catalyst composition system without being polymerized.
• conjugated diene-based monomer used in the preparation of the catalyst composition some amount within a total amount range of the conjugated diene-based monomer used in the polymerization reaction may be used, and, for example, the conjugated diene-based monomer may be used in an amount of 1 mol to 100 mol, for example, 10 mol to 50 mol, or 20 mol to 50 mol based on 1 mol of the lanthanide rare earth element-containing compound.
• the catalyst composition according to the embodiment of the present invention may be prepared by sequentially mixing the above-described lanthanide rare earth element-containing compound and at least one of the alkylating agent, the halide, and the conjugated diene-based monomer, specifically, the lanthanide rare earth element-containing compound, alkylating agent, halide, and selectively conjugated diene-based monomer, in an organic solvent.
• the organic solvent may be a non-polar solvent that is not reactive with the above-described catalyst components.
• the non-polar solvent may include linear, branched, or cyclic aliphatic hydrocarbon having 5 to 20 carbon atoms such as n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, isopentane, isohexane, isoheptane, isooctane, 2,2-dimethylbutane, cyclopentane, cyclohexane, methylcyclopentane, or methylcyclohexane; a mixed solvent of aliphatic hydrocarbon having 5 to 20 carbon atoms such as petroleum ether or petroleum spirits, or kerosene; or an aromatic hydrocarbon-based solvent such as benzene, toluene, ethylbenzene, and xylene, and any one thereof or a mixture of two or more thereof may be used.
• the non-polar solvent may more specifically include the above-described linear, branched, or cyclic aliphatic hydrocarbon having 5 to 20 carbon atoms or the above-described mixed solvent of aliphatic hydrocarbon, and, for example, may include n-hexane, cyclohexane, or a mixture thereof.
• the organic solvent may be appropriately selected depending on a type of the constituent material constituting the catalyst composition, particularly, the alkylating agent.
• alkylaluminoxane such as methylaluminoxane (MAO) or ethylaluminoxane, as the alkylating agent
• MAO methylaluminoxane
• ethylaluminoxane as the alkylating agent
• an aromatic hydrocarbon-based solvent may be appropriately used.
• an aliphatic hydrocarbon-based solvent may be appropriately used.
• an aliphatic hydrocarbon-based solvent such as hexane, mainly used as a polymerization solvent, it may be more advantageous to the polymerization reaction.
• the aliphatic hydrocarbon-based solvent may promote catalytic activity, and may further improve reactivity by the catalytic activity.
• the organic solvent may be used in an amount of 20 mol to 20,000 mol, for example, 100 mol to 1,000 mol, based on 1 mol of the lanthanide rare earth element-containing compound.
• the polymerization of step 1 may be performed by coordination anionic polymerization or radical polymerization, may specifically be bulk polymerization, solution polymerization, suspension polymerization, or emulsion polymerization, and, for example, may be solution polymerization.
• the polymerization may be performed by any method of batch and continuous methods. Specifically, the polymerization of step 1 may be performed by adding the conjugated diene-based monomer to the catalyst composition and performing a reaction in the organic solvent.
• the organic solvent may be further added in addition to the amount of the organic solvent which may be used in the preparation of the catalyst composition, and specific types thereof may be the same as described above. Also, when the organic solvent is used, a concentration of the monomer may be in a range of 3 wt % to 80 wt %, or 10 wt % to 30 wt %.
• an additive for example, a reaction terminating agent for the completion of the polymerization reaction, such as polyoxyethylene glycol phosphate; or an antioxidant, such as 2,6-di-t-butylparacresol, may be further used.
• a reaction terminating agent for the completion of the polymerization reaction such as polyoxyethylene glycol phosphate
• an antioxidant such as 2,6-di-t-butylparacresol
• an additive that usually facilitates solution polymerization specifically, an additive, such as a chelating agent, a dispersant, a pH adjuster, a deoxidizer, or an oxygen scavenger, may be further selectively used.
• the polymerization may be temperature rise polymerization, isothermal polymerization, or constant temperature polymerization (adiabatic polymerization).
• the constant temperature polymerization denotes a polymerization method including a step of performing polymerization not by randomly applying heat but with its own reaction heat after the organometallic compound is added
• the temperature rise polymerization denotes a polymerization method in which the temperature is increased by randomly applying heat after the organometallic compound is added
• the isothermal polymerization denotes a polymerization method in which the temperature of the polymer is constantly maintained by taking away heat or applying heat after the organometallic compound is added.
• the polymerization may be performed in a temperature range of ⁇ 20° C. to 200° C., particularly in a temperature range of 20° C. to 150° C., and more particularly in a temperature range of 10° C. to 120° C. for 15 minutes to 3 hours.
• the temperature during the polymerization is greater than 200° C., it is difficult to sufficiently control the polymerization reaction and the cis-1,4 bond content of the formed diene-based polymer may be decreased, and, in a case in which the temperature is less than ⁇ 20° C., polymerization rate and efficiency may be reduced.
• Step 2 is a step of reacting the active polymer with the modifier represented by Formula 1, in order to prepare a conjugated diene-based polymer.
• the modifier represented by Formula 1 may be the same as described above, and at least one type thereof may be mixed and used in the reaction.
• the modifier represented by Formula 1 may be used in an amount of 0.5 mol to 20 mol based on 1 mol of the lanthanide rare earth element-containing compound in the catalyst composition. Specifically, the modifier represented by Formula 1 may be used in an amount of 1 mol to 10 mol based on 1 mol of the lanthanide rare earth element-containing compound in the catalyst composition. Since the optimal modification reaction may be performed when the modifier is used in an amount that satisfies the above range, a conjugated diene-based polymer having a high modification ratio may be obtained.
• the reaction of step 2 is a modification reaction for the introduction of a functional group into the polymer, wherein the reaction may be performed in a temperature range of 0° C. to 90° C. for 1 minute to 5 hours.
• the method of preparing a modified conjugated diene-based polymer according to the embodiment of the present invention may be performed by a batch polymerization method or a continuous polymerization method including one or more reactors.
• the polymerization reaction may be stopped by adding an isopropanol solution of 2,6-di-t-butyl-p-cresol (BHT) to a polymerization reaction system.
• BHT 2,6-di-t-butyl-p-cresol
• a modified conjugated diene-based polymer may be obtained through a desolvation treatment, such as steam stripping in which a partial pressure of the solvent is reduced by supplying water vapor, or a vacuum drying treatment.
• an unmodified active polymer may be included in a reaction product obtained as a result of the above-described modification reaction.
• the preparation method according to the embodiment of the present invention may further include at least one step of recovering solvent and unreacted monomer and drying, if necessary, after step 2.
• the present invention provides a rubber composition including the above modified conjugated diene-based polymer and a molded article prepared from the rubber composition.
• the rubber composition according to an embodiment of the present invention may include the modified conjugated diene-based polymer in an amount of 0.1 wt % or more to 100 wt % or less, particularly 10 wt % to 100 wt %, and more particularly 20 wt % to 90 wt %.
• the amount of the modified conjugated diene-based polymer is less than 0.1 wt %, an effect of improving abrasion resistance and crack resistance of a molded article prepared by using the rubber composition, for example, a tire, may be insignificant.
• the rubber composition may further include other rubber components, if necessary, in addition to the modified conjugated diene-based polymer, and, in this case, the rubber component may be included in an amount of 90 wt % or less based on a total weight of the rubber composition. Specifically, the rubber component may be included in an amount of 1 part by weight to 900 parts by weight based on 100 parts by weight of the modified conjugated diene-based polymer.
• the rubber component may be a natural rubber or a synthetic rubber, and, for example, the rubber component may be a natural rubber (NR) including cis-1,4-polyisoprene; a modified natural rubber, such as an epoxidized natural rubber (ENR), a deproteinized natural rubber (DPNR), and a hydrogenated natural rubber, in which the general natural rubber is modified or purified; and a synthetic rubber such as a styrene-butadiene rubber (SBR), polybutadiene (BR), polyisoprene (IR), a butyl rubber (IIR), an ethylene-propylene copolymer, polyisobutylene-co-isoprene, neoprene, poly(ethylene-co-propylene), poly(styrene-co-butadiene), poly(styrene-co-isoprene), poly(styrene-co-isoprene-co-butadiene), poly(iso
• the rubber composition may include 0.1 part by weight to 150 parts by weight of a filler based on 100 parts by weight of the modified conjugated diene-based polymer, and the filler may include a silica-based filler, a carbon black-based filler, or a combination thereof.
• the filler may be carbon black.
• the carbon black-based filler is not particularly limited, but, for example, may have a nitrogen surface area per gram (N 2 SA, measured according to JIS K 6217-2:2001) of 20 m 2 /g to 250 m 2 /g. Also, the carbon black may have a dibutyl phthalate (DBP) oil absorption of 80 cc/100 g to 200 cc/100 g. If the nitrogen surface area per gram of the carbon black is greater than 250 m 2 /g, processability of the rubber composition may be reduced, and, if the nitrogen surface area per gram of the carbon black is less than 20 m 2 /g, reinforcement by carbon black may be insignificant.
• N 2 SA nitrogen surface area per gram
• DBP dibutyl phthalate
• the processability of the rubber composition may be reduced, and, if the DBP oil absorption of the carbon black is less than 80 cc/100 g, the reinforcement by carbon black may be insignificant.
• the silica-based filler is not particularly limited, but, for example, may include wet silica (hydrous silicic acid), dry silica (anhydrous silicic acid), calcium silicate, aluminum silicate, or colloidal silica.
• the silica-based filler may be wet silica in which an effect of improving both fracture characteristics and wet grip is the most significant.
• the silica may have a nitrogen surface area per gram (N 2 SA) of 120 m 2 /g to 180 m 2 /g, and a cetyltrimethylammonium bromide (CTAB) surface area per gram of 100 m 2 /g to 200 m 2 /g.
• N 2 SA nitrogen surface area per gram
• CTAB cetyltrimethylammonium bromide
• the nitrogen surface area per gram of the silica is less than 120 m 2 /g, reinforcement by silica may be insignificant, and, if the nitrogen surface area per gram of the silica is greater than 180 m 2 /g, the processability of the rubber composition may be reduced. Also, if the CTAB surface area per gram of the silica is less than 100 m 2 /g, the reinforcement by silica, as the filler, may be insignificant, and, if the CTAB surface area per gram of the silica is greater than 200 m 2 /g, the processability of the rubber composition may be reduced.
• silica is used as the filler
• a silane coupling agent may be used together for the improvement of reinforcement and low heat generation property.
• silane coupling agent may be bis(3-triethoxysilylpropyl)tetrasulfide, bis(3-triethoxysilylpropyl)trisulfide, bis(3-triethoxysilylpropyl)disulfide, bis(2-triethoxysilylethyl)tetrasulfide, bis(3-trimethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, 3-mercaptopropyl trimethoxysilane, 3-mercaptopropyl triethoxysilane, 2-mercaptoethyl trimethoxysilane, 2-mercaptoethyl triethoxysilane, 3-trimethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-triethoxysilylpropyl-N,
• the silane coupling agent may be bis(3-triethoxysilylpropyl)polysulfide or 3-trimethoxysilylpropyl benzothiazyl tetrasulfide.
• the silane coupling agent may be used in an amount of 1 part by weight to 20 parts by weight based on 100 parts by weight of the silica.
• the silane coupling agent may prevent gelation of the rubber component while sufficiently having an effect as a coupling agent.
• the silane coupling agent may be used in an amount of 5 parts by weight to 15 parts by weight based on 100 parts by weight of the silica.
• the rubber composition according to the embodiment of the present invention may be sulfur cross-linkable, and, accordingly, may further include a vulcanizing agent.
• the vulcanizing agent may specifically be sulfur powder, and may be included in an amount of 0.1 part by weight to 10 parts by weight based on 100 parts by weight of the rubber component.
• the vulcanizing agent is included within the above range, elastic modulus and strength required for the vulcanized rubber composition may be secured and, simultaneously, a low fuel consumption property may be obtained.
• the rubber composition according to the embodiment of the present invention may further include various additives, such as a vulcanization accelerator, process oil, a plasticizer, an antioxidant, a scorch inhibitor, zinc white, stearic acid, a thermosetting resin, or a thermoplastic resin, used in the general rubber industry, in addition to the above-described components.
• additives such as a vulcanization accelerator, process oil, a plasticizer, an antioxidant, a scorch inhibitor, zinc white, stearic acid, a thermosetting resin, or a thermoplastic resin, used in the general rubber industry, in addition to the above-described components.
• the vulcanization accelerator is not particularly limited, but, specifically, a thiazole-based compound, such as 2-mercaptobenzothiazole (M), dibenzothiazyl disulfide (DM), and N-cyclohexylbenzothiazole-2-sulfenamide (CZ), or a guanidine-based compound, such as diphenylguanidine (DPG), may be used.
• a thiazole-based compound such as 2-mercaptobenzothiazole (M), dibenzothiazyl disulfide (DM), and N-cyclohexylbenzothiazole-2-sulfenamide (CZ)
• CZ N-cyclohexylbenzothiazole-2-sulfenamide
• DPG diphenylguanidine
• the vulcanization accelerator may be included in an amount of 0.1 part by weight to 5 parts by weight based on 100 parts by weight of the rubber component.
• the process oil acts as a softener in the rubber composition, wherein the process oil may be a paraffin-based, naphthenic-based, or aromatic-based compound, and, for example, the aromatic-based compound may be used in consideration of tensile strength and abrasion resistance, and the naphthenic-based or paraffin-based process oil may be used in consideration of hysteresis loss and low temperature characteristics.
• the process oil may be included in an amount of 100 parts by weight or less based on 100 parts by weight of the rubber component, and, when the process oil is included in the above amount, decreases in tensile strength and low heat generation property (low fuel consumption property) of the vulcanized rubber may be prevented.
• antioxidants may be N-isopropyl-N′-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, or a high-temperature condensate of diphenylamine and acetone.
• the antioxidant may be used in an amount of 0.1 part by weight to 6 parts by weight based on 100 parts by weight of the rubber component.
• the rubber composition according to the embodiment of the present invention may be obtained by kneading the above mixing formulation using a kneader such as a Banbury mixer, a roll, and an internal mixer, and a rubber composition having excellent abrasion resistance as well as low heat generation property may also be obtained by a vulcanization process after molding.
• a kneader such as a Banbury mixer, a roll, and an internal mixer
• the rubber composition may be suitable for the preparation of each member of a tire, such as a tire's tread, an under tread, a sidewall, a carcass coating rubber, a belt coating rubber, a bead filler, a chafer, or a bead coating rubber, or various industrial rubber products such as an anti-vibration rubber, a belt conveyor, and a hose.
• a tire's tread such as a tire's tread, an under tread, a sidewall, a carcass coating rubber, a belt coating rubber, a bead filler, a chafer, or a bead coating rubber
• various industrial rubber products such as an anti-vibration rubber, a belt conveyor, and a hose.
• the molded article prepared by using the rubber composition may include a tire or a tire's tread.
• 900 g of 1,3-butadiene and 6.6 kg of n-hexane were added to a 20 L autoclave reactor, and an internal temperature of the reactor was then increased to 70° C.
• a catalyst composition which was prepared by a reaction of a hexane solution having 0.10 mmol of Nd(2,2-diethyl decanoate) 3 with 0.89 mmol of diisobutylaluminum hydride (DIBAH), 0.24 mmol of diethylaluminum chloride, and 3.3 mmol of 1,3-butadiene, was added to the reactor, polymerization was performed for 60 minutes.
• DIBAH diisobutylaluminum hydride
• WINGSTAY Eliokem SAS, France
• 900 g of 1,3-butadiene and 6.6 kg of n-hexane were added to a 20 L autoclave reactor, and an internal temperature of the reactor was then increased to 70° C.
• a catalyst composition which was prepared by a reaction of a hexane solution having 0.10 mmol of Nd(2,2-diethyl decanoate) 3 with 0.89 mmol of diisobutylaluminum hydride (DIBAH), 0.24 mmol of diethylaluminum chloride, and 3.3 mmol of 1,3-butadiene, was added to the reactor, polymerization was performed for 60 minutes.
• DIBAH diisobutylaluminum hydride
• WINGSTAY Eliokem SAS, France
• 900 g of 1,3-butadiene and 6.6 kg of n-hexane were added to a 20 L autoclave reactor, and an internal temperature of the reactor was then increased to 70° C.
• a catalyst composition which was prepared by a reaction of a hexane solution having 0.10 mmol of Nd(2,2-diethyl decanoate) 3 with 0.89 mmol of diisobutylaluminum hydride (DIBAH), 0.24 mmol of diethylaluminum chloride, and 3.3 mmol of 1,3-butadiene, was added to the reactor, polymerization was performed for 60 minutes.
• DIBAH diisobutylaluminum hydride
• WINGSTAY Eliokem SAS, France
• 900 g of 1,3-butadiene and 6.6 kg of n-hexane were added to a 20 L autoclave reactor, and an internal temperature of the reactor was then increased to 70° C.
• a catalyst composition which was prepared by a reaction of a hexane solution having 0.10 mmol of Nd(2,2-diethyl decanoate) 3 with 0.89 mmol of diisobutylaluminum hydride (DIBAH), 0.24 mmol of diethylaluminum chloride, and 3.3 mmol of 1,3-butadiene, was added to the reactor, polymerization was performed for 60 minutes.
• DIBAH diisobutylaluminum hydride
• WINGSTAY Eliokem SAS, France
• 900 g of 1,3-butadiene and 6.6 kg of n-hexane were added to a 20 L autoclave reactor, and an internal temperature of the reactor was then increased to 70° C.
• a catalyst composition which was prepared by a reaction of a hexane solution having 0.10 mmol of Nd(2,2-diethyl decanoate) 3 with 0.89 mmol of diisobutylaluminum hydride (DIBAH), 0.24 mmol of diethylaluminum chloride, and 3.3 mmol of 1,3-butadiene, was added to the reactor, polymerization was performed for 60 minutes.
• DIBAH diisobutylaluminum hydride
• a hexane solution in which 1.0 g of a polymerization terminator was included, and 33 g of a solution, in which 30 wt % of WINGSTAY (Eliokem SAS, France), as an antioxidant, was dissolved in hexane, were added.
• a polymer thus obtained was put in hot water heated by steam and stirred to remove the solvent, and was then roll-dried to remove the remaining solvent and water to prepare a butadiene polymer.
• GPC gel permeation chromatography
• Mooney viscosity (MV) of each polymer was measured with a large rotor at a rotor speed of 2 ⁇ 0.02 rpm at 100° C. using MV2000E by Monsanto Company. After each polymer was left standing for 30 minutes or more at room temperature (23 ⁇ 3° C.), 27 ⁇ 3 g of each polymer was taken as a sample used in this case and filled into a die cavity, and Mooney viscosity was measured while applying a torque by operating a platen.
• Mooney viscosity, tensile strength, 300% modulus, elongation, and viscoelasticity were respectively measured by the following methods. Among them, the 300% modulus, tensile strength, elongation, and viscoelasticity were expressed by indexing measurement values of Comparative Example at 100. The results thereof are presented in Table 2 below.
• Mooney viscosity (ML1+4) of each rubber sample was measured with a large rotor at a rotor speed of 2 ⁇ 0.02 rpm at 100° C. using MV2000E by Monsanto Company.
• Tan ⁇ property that is most important for low fuel consumption property
• a viscoelastic coefficient (tan ⁇ ) was measured at a frequency of 10 Hz, a prestrain of 5%, a dynamic strain of 3%, and a temperature of 60° C. using DMTS 500N by Gabo Instruments, Germany.
• DMTS 500N DMTS 500N by Gabo Instruments, Germany.

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